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Return to Parts List Category : L- AR Engineering Products ARE AR403B CAM SYNC $250.00 AR403 is a cam sync unit available for both B and RB engines. This cam sync unit works with a Ford Explorer sensor and will provide a 180 degree signal for an EFI conversion. The signal will be high voltage for 180 degrees of cam rotation and then low voltage for 180 degrees. Order AR403B for B engines and AR403RB for RB engines. Use with Airtex 5S1283 or Standard Motor Products LXZ260T sensor. Motorcraft wiring harness WPT196 may be helpful when wiring your harness.